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Finding the Fourth Proportional to 2,187.36, 3,281.12 and 871.20

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Solution

The fourth proportional to 2,187.36, 3,281.12 and 871.20 is: 1,306.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.36 : 3,281.12 = 871.20 : x
  2. Step 2: Convert to fraction form
    2,187.36/3,281.12 = 871.20/x
  3. Step 3: Cross multiply
    2,187.36x = 3,281.12 × 871.20
  4. Step 4: Simplify right side
    2,187.36x = 2,858,511.74
  5. Step 5: Solve for x
    x = 2,858,511.74/2,187.36
  6. Step 6: Final answer
    x = 1,306.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.